There were problems importing the following widgets:OWMDS: No module named Qwt5OWNetExplorer: No module named Qwt5OWHierarchicalClustering: No module named Qwt5OWNetworkFromDistances: No module named Qwt5OWSOMVisualizer: No module named Qwt5OWDistanceMap: No module named Qwt5OWInteractionGraph: No module named Qwt5OWKMeans: No module named Qwt5OWCalibrationPlot: No module named Qwt5OWROC: No module named Qwt5OWLiftCurve: No module named Qwt5OWItemsetViz: No module named Qwt5OWMetaMiner: No module named scipy.statsOWDataGenerator: No module named Qwt5OWScatterPlot3D: No module named OpenGLOWQuickSelect: No module named Qwt5OWModelEmbedder: No module named Qwt5OWCompare: No module named Qwt5OWRScript: No module named rpy2.robjectsOWPerformanceCurves: No module named Qwt5OWTimeline: No module named Qwt5OWTimeDataVisualizer: No module named Qwt5OWScatterPlot: No module named Qwt5OWMosaicDisplay: No module named Qwt5OWCorrespondenceAnalysis: No module named Qwt5OWSieveDiagram: No module named Qwt5OWAttributeStatistics: No module named Qwt5OWRadviz: No module named Qwt5OWMultiCorrespondenceAnalysis: No module named Qwt5OWLinProj: No module named Qwt5OWDistributions: No module named Qwt5OWPolyviz: No module named Qwt5OWParallelCoordinates: No module named Qwt5OWSurveyPlot: No module named Qwt5OWSieveMultigram: No module named Qwt5OWDiscretize: No module named Qwt5The following widgets could not be imported and will not be available: OWLiftCurve, OWSurveyPlot, OWHierarchicalClustering, OWLinProj, OWMultiCorrespondenceAnalysis, OWDistributions, OWMosaicDisplay, OWDistanceMap, OWInteractionGraph, OWNetworkFromDistances, OWScatterPlot, OWMDS, OWPolyviz, OWSieveMultigram, OWDiscretize, OWNetExplorer, OWSieveDiagram, OWRadviz, OWCalibrationPlot, OWParallelCoordinates, OWCorrespondenceAnalysis, OWSOMVisualizer, OWROC, OWKMeans, OWAttributeStatistics.The following prototype widgets could not be imported and will not be available: OWPerformanceCurves, OWRScript, OWModelEmbedder, OWItemsetViz, OWTimeline, OWQuickSelect, OWTimeDataVisualizer, OWDataGenerator, OWMetaMiner, OWScatterPlot3D, OWCompare.Unhandled exception of type RuntimeError occured at 18:06:03:Traceback: File: orange-canvas, line8 in <module> Code: execfile(__canvas) File: orngCanvas.pyw, line903 in <module> Code: sys.exit(main()) File: orngCanvas.pyw, line893 in main Code: dlg = OrangeCanvasDlg(app) File: orngCanvas.pyw, line200 in __init__ Code: self.reportWindow = OWReport.ReportWindow() File: OWBaseWidget.py, line123 in __new__ Code: self.currentContexts = {}# the "currentContexts" MUST be the first thing assigned to a widget File: OWBaseWidget.py, line894 in __setattr__ Code: return unisetattr(self, name, value, QDialog) File: OWBaseWidget.py, line52 in unisetattr Code: controlledAttributes = getattr(self, "controlledAttributes", None) RuntimeError: underlying C/C++ object has been deleted

Indeed, it seems related to the problem you are pointing (I also run sip version 4.12.1). I will try to rollback sip to a former version.